The length of use of resin fillings generally varies from 3-5 years. The exact duration of use is closely related to the size of the defect, care measures and other factors. First of all, the larger the defect, the more resin material is required to fill it. The more the human body chews or bites, the more the resin material in the repair is subjected to force, which will adversely affect the service life of the resin material. In addition, the daily care of the oral cavity has a direct impact on the service life of the resin material. If the patient does not pay attention to the oral cleaning work for a long time in the process of daily life and diet, or often eat food with too hard texture. This will not only directly shorten the service life of the resin filling material, but also cause secondary diseases such as tooth decay, periodontitis and pulpitis. Patients are advised to avoid biting or chewing on hard objects using the filling side after receiving the filling treatment. Then again, in daily life, it is necessary to do a good job of oral hygiene care and have regular follow-up examinations.